Isocolus fitchi (Kieffer, 1898)
Rotund, unilocular, hard or fleshy swelling of 4-8 mm in the lower part of the stem, or the petiole or midrib of a ground leaf. Not infrequently several galles together, and then sometimes partially fused. Univoltine, pupation and hibernation in the gall.
Asteraceae, narrowly monophagous
According to Buhr the galls only occur in the stems.
Buhr (1964a), Dauphin & Aniotsbehere (1997a), Eady & Quinlan (1963a), Houard (1909a), Melika (2006a), Nieves-Aldrey (1984a, 2001a), Redfern & Shirley (2011a), Tavares (1905a [“Aulax fichti”]), Tomasi (2014a).